Frame and Underbody GMC Sierra 2500

Fastener Tightening Specifications

Fastener Tightening Specifications

Scheme 1

Tow Hook Replacement (1500 Series)

Scheme 2

Tow Hook Replacement (2500/3500 Series)

Removal Procedure

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/gmc/sierra-2500/2012-2012/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the mounting bolts for the oil pan skid plate.
3. Remove the oil pan skid plate.
4. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/gmc/sierra-2500/2012-2012/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
5. Remove the mounting bolts for the oil pan skid plate.
6. Remove the oil pan skid plate.

Installation Procedure

1. Position the oil skid plate on the frame.
2. Install the oil skid plate mounting bolts and tighten to 28 N.m (21 lb ft).

Scheme 3

Engine Shield Replacement

Scheme 4

Engine Lower Front Splash Shield Replacement

Scheme 5

Fuel Tank Shield Replacement

Scheme 6

Drivetrain and Front Suspension Frame Front Crossmember Replacement (2500/3500 Series)

Scheme 7

Drivetrain and Front Suspension Frame Front Crossmember Replacement (1500 Series)

Scheme 8

Transmission Support Crossmember Replacement (2WD 1500 Series)

Scheme 9

Transmission Support Crossmember Replacement (4WD 1500 Series)

Scheme 10

Transmission Support Crossmember Replacement (2WD 2500/3500 Series)

Transmission Support Crossmember Replacement (4WD 2500/3500 Series)

Transmission Support Crossmember Replacement (4WD 2500/3500 Series)

Scheme 11

Body Cable Replacement

1. Remove the master cylinder. Perform the following steps: Remove the nuts retaining the master cylinder to the brake booster. Remove the master cylinder from the brake booster. Secure the cylinder away from the booster.
2. Raise the vehicle on the hoist. Refer to «Lifting and Jacking the Vehicle»(/gmc/sierra-2500/2012-2012/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
3. Remove the park brake equalizer intermediate cable. Perform the following steps: Remove the nut from the park brake equalizer intermediate cable. Remove the intermediate cable from the equalizer. Depress the retaining tabs that secure the park brake cable to the frame. Pull slightly on the cable from the mounting area in order to provide slack for body movement without binding the cable.
4. Remove the body mount bolts.
5. Properly support the body in the area that the mounts will be replaced.
6. Lower the chassis accordingly in order to remove the cushions (1) as necessary.

1. Install the cushions (1) as necessary and raise the chassis accordingly.
2. Perform the following procedure before installing the bolts. Remove all traces of the original adhesive patch. Clean the threads of the bolt with denatured alcohol or equivalent and allow to dry. Apply Threadlocker GM P/N 12345493 (Canadian P/N 10953488).
3. Install the body mount bolts and tighten to 70 N.m (52 lb ft).
4. Install the park brake equalizer intermediate cable. Perform the following steps: Pull rearward on the park brake cable to the original position. Secure the cable retaining tabs to the frame. Install the intermediate cable end to the equalizer. Install the nut to the threaded end of the intermediate cable. Tighten the nut to 4 N.m (35 lb in).
5. Lower the vehicle.
6. Install the master cylinder. Perform the following steps: Mount the master cylinder to the brake booster. Install the master cylinder mounting nuts and tighten to 36 N.m (27 lb ft).

1. Remove the master cylinder. Perform the following steps: Remove the nuts retaining the master cylinder to the brake booster. Remove the master cylinder from the brake booster. Secure the cylinder away from the booster.
2. Raise the vehicle on the hoist. Refer to «Lifting and Jacking the Vehicle»(/gmc/sierra-2500/2012-2012/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
3. Remove the park brake equalizer intermediate cable. Perform the following steps: Remove the nut from the park brake equalizer intermediate cable. Remove the intermediate cable from the equalizer. Depress the retaining tabs that secure the park brake cable to the frame. Pull slightly on the cable from the mounting area in order to provide slack for body movement without binding the cable.
4. Remove the body mount bolts.
5. Properly support the body in the area that the mounts will be replaced.
6. Lower the chassis accordingly in order to remove the cushions (1) as necessary.

1. Install the cushions (1) as necessary and raise the chassis accordingly.
2. Perform the following procedure before installing the bolts. Remove all traces of the original adhesive patch. Clean the threads of the bolt with denatured alcohol or equivalent and allow to dry. Apply Threadlocker GM P/N 12345493 (Canadian P/N 10953488).
3. Install the body mount bolts and tighten to 70 N.m (52 lb ft).
4. Install the park brake equalizer intermediate cable. Perform the following steps: Pull rearward on the park brake cable to the original position. Secure the cable retaining tabs to the frame. Install the intermediate cable end to the equalizer. Install the nut to the threaded end of the intermediate cable. Tighten the nut to 4 N.m (35 lb in).
5. Lower the vehicle.
6. Install the master cylinder. Perform the following steps: Mount the master cylinder to the brake booster. Install the master cylinder mounting nuts and tighten to 36 N.m (27 lb ft).

Scheme 12

Front Wheelhouse Liner Replacement - Right Side (GMC)

Scheme 13

Front Wheelhouse Liner Replacement - Right Side (Chevrolet)

Scheme 14

Front Wheelhouse Liner Replacement - Left Side (GMC)

Scheme 15

Front Wheelhouse Liner Replacement - Left Side (Chevrolet)

Scheme 16

Engine Splash Shield Replacement - Left Side

Scheme 17

Engine Splash Shield Replacement - Right Side

Scheme 18

Assist Step Replacement

1. Disconnect the trailer wiring harness connector (3) from the trailer wiring receptacle (4).
2. Remove the retainers (1) securing the trailer wiring harness (2) to the hitch platform.
3. Remove the hitch platform bolts (5) from the bumper weld nuts (4).
4. Remove the nuts (7) and bolts (1) securing the hitch platform to the frame rails.
5. Remove the hitch platform bolts (6) from the frame weld nuts (2).
6. Remove the hitch platform from the vehicle.

1. Position the hitch platform to the vehicle.
2. Install the hitch platform bolts (6) to the frame weld nuts (2). Tighten the bolts to 100 N.m (74 lb ft).
3. Install the bolts (1) and nuts (7) securing the hitch platform to the frame rails. Tighten the nuts to 113 N.m (83 lb ft).
4. Install the hitch platform bolts (5) to the bumper weld nuts (4). Tighten the bolts to 140 N.m (103 lb ft).
5. Install the retainers (1) securing the trailer wiring harness (2) to the hitch platform.
6. Connect the trailer wiring harness connector (3) to the trailer wiring receptacle (4).

1. Remove the hitch platform bolts (5) from the bumper weld nuts (4).
2. Remove the nuts (7) and bolts (1) securing the hitch platform to the frame rails.
3. Remove the hitch platform bolts (6) from the frame weld nuts (2).
4. Remove the hitch platform from the vehicle.

1. Position the hitch platform to the vehicle.
2. Install the hitch platform bolts (6) to the frame weld nuts (2). Tighten the bolts to 100 N.m (74 lb ft).
3. Install the bolts (1) and nuts (7) securing the hitch platform to the frame rails. Tighten the nuts to 113 N.m (83 lb ft).
4. Install the hitch platform bolts (5) to the bumper weld nuts (4). Tighten the bolts to 140 N.m (103 lb ft).

See also:
• Fastener Caution
• Lifting and Jacking the Vehicle
• Component Fastener Tightening Caution
• Exhaust Hanger Mounting Bracket Replacement (without L96/E63/ZW9)
• Transmission Mount Replacement
• Tire and Wheel Removal and Installation
• Oil Pan Skid Plate Replacement (2500/3500 with RPO NZZ)